Improvement in coloring leather



' cording to circumstances.-

about three UNITED STATES PATENT Orrton. v

. JOHN norrrrz, or" BOSTON, AND rnnnnnnr n. MAYER, or oiinnnin'cn- PORT, MASSACHUSETTS.

IMPROVEMENT m COLORING LEATHER.

Specification forming part of Letters Patent No. 142,797, dated September 16, 1873; application filed March 29, 1873.

To all whom itmay concern.-

Be it known that we, JOHN Korrrrz, of

Boston, of .the county of Suffolk and State, of

Massachusetts, and FREDERIK B. MAYER, of

Cambridgeport, of the county of Middl escx,

of said State, have invented a new and useful Improvement'in Coloring Leather or various other substances, and do hereby declare .the same to be fully described as follows:

pound of starch to one quart of the solution, although the proportions are to be varied acing the leather we employ various aniline colors or pigments, and we prepare each as .followsthat is to say, we first dissolve the color or pigment in alcohol-that is to say, we use for each ounce of the aniline pigment about one pint-of alcohol. To this we add quarts of vinegar, and next boil the solution a few minutes. It is then ready for use. N ext, the preparation of ground color is to be sprinkled on the leather, -or the latter is to be covered with such preparation to the necessary extent, after which the other color or colors or preparation of aniline, as above explained, is to be sprinkled or thrown upon the leather to the extent required. The starch of the first preparation will cause it' to resist the aniline color or colors, or second preparation, whereby there will result a softening or shading together of the spots of ground and other colors at their edges in contact. This softening or blending of the masses or spots of colors at their edges with .the ground colors produces a very pleasing effect, and although the leather has an appearance much like that of marbled paper, used in hook-binding, no bath is required to produce the effect, as in the process of marblin gpa per. Furthermore, the preparation of the aniline color, by the cmplovnwnt of alcohol and vin- I .whcnever the ground starch, as explained, becomes covered with For further color egar, in manner as described, renders the color stable, or not easily oxidizable by light, the preparation being peculiarly fitted for colorin g leather with one plain color without first employing a 'ground' color prepared with starch, as set forth. 4

We would observe that, generally speaking, color prepared with the aniline color, the latter becomes readily removable by watch so that, after a skin'may have been sprinkled with the ground and aniline dyes or colors, and is afterward washed, the aniline colors will remain fast in such portions of the skin'not covered by the ground or starch color, but will be mostly if not en-- tirely removed from the parts on which the starch color or ground may have been thrown.

By our process and means, as set forth, we are able to color'le'ather or other substances for use in the arts with great economy, and with excellent practical and ornamental results.

, We make no claim to'the method of preparing colors from aniline, as described in Let. ters Patent N 0. 46,804, dated March 14, 1865, and granted to Xavier Karcheski, such covering a white base mixed with starch-water, a solution of tannic acid, and a solution of uniline with fresh milk or dissolved glue.

We claim as our invention as follows, viz:

1. The employmentfor the purpose, and substantially as described, of ground and aniline. colors, prepared in manner and by means as explained.

2. The combination or solution of an aniline pigment, alcohol, by heat, as set forth.

3, The employment, on a surface of starch, in a colored solution to resist a solution of aniline when daily as specified.

- JOHN KOPPITZ.

EREDERIK BUCK MAYER.

Witnesses:

R. H Ennr, .Tjlt, Snow.

and vinegar prepared applied to such surface, essen 

